photographic sound recorder
photographic sound recorder[¦fōd·ə¦graf·ik ′sau̇nd ri‚kȯrd·ər]
A sound recorder having means for producing a modulated light beam and means for moving a light-sensitive medium relative to the beam to give a photographic recording of sound signals. Also known as optical sound recorder.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.